12:00M. I heard thrasher sub-song coming from the glade at about 11:30, so went there to listen. It was Brownie up on a horizontal branch of the old oak. She was giving one imitation after another in rapid succession, all mixed up together. To the whistled call for the dog this time, she was adding that sort of prolonged kiss- ing sound which some persons use in trying to attract the attention of animals, but the hypothetical dog did not answer. Greenie came to dig at the top of the bank on the north side of the glade and Brownie came down to the the floor and began all over again. Her mimicry of the russet backed thrush was especially convincing. While she was thus engaged, a stone, released by Greenie came rolling down the bank, blup, blup,blup, stopping not far from his mate. Brownie immediately ran up the bank and they argued the matter in pantomime--no sound beyond the original interchange of h-a-1-hg when she arrived. This soundless exchange of remarks, in which first one bird and then the other opens and closes its bill while facing the other--it seems to me--must be some form of communication, like the Morse code with flags,or wig-wagging. I picked up the stone and weighed it. It weighed 1¾ pounds exactly. Roughly this is of the order of seven times the weight of the bird, or expressed in human equivalents: Greenie's effort equals that of a hundred and fifty pound man digging up a thousand pound rock with his nose, lifting it out of the excavation and starting it down a hill, all with the same implement! To be quite fair to the man we should grant him a nut-cracker arrangement of nose and chin,like Mr. Punch, say 2 or 3 feet long and made of tungsten steel. With this equipment allowed, it will be appreci- ated how deficient he would still be in muscular processes. 12:30 (Received by post from Dr. Grinnell his personal copy of Nicholson's."The Art of Bird Watching", a work with which